Trait std::borrow::ToOwned

pub trait ToOwned {
    type Owned: Borrow<Self>;
#[must_use = "cloning is often expensive and is not expected to have side effects"]
    fn to_owned(&self) -> Self::Owned;

    fn clone_into(&self, target: &mut Self::Owned) { ... }
}

A generalization of Clone to borrowed data.

Some types make it possible to go from borrowed to owned, usually by implementing the Clone trait. But Clone works only for going from &T to T. The ToOwned trait generalizes Clone to construct owned data from any borrow of a given type.

Associated Types

type Owned: Borrow<Self>

The resulting type after obtaining ownership.

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Required methods

#[must_use = "cloning is often expensive and is not expected to have side effects"] fn to_owned(&self) -> Self::Owned

Creates owned data from borrowed data, usually by cloning.

Examples

Basic usage:

let s: &str = "a";
let ss: String = s.to_owned();

let v: &[i32] = &[1, 2];
let vv: Vec<i32> = v.to_owned();

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Provided methods

fn clone_into(&self, target: &mut Self::Owned)

🔬 This is a nightly-only experimental API. (toowned_clone_into #41263)

recently added

Uses borrowed data to replace owned data, usually by cloning.

This is borrow-generalized version of Clone::clone_from.

Examples

Basic usage:

let mut s: String = String::new();
"hello".clone_into(&mut s);

let mut v: Vec<i32> = Vec::new();
[1, 2][..].clone_into(&mut v);

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Implementors

impl ToOwned for str

type Owned = String

fn to_owned(&self) -> String

fn clone_into(&self, target: &mut String)

🔬 This is a nightly-only experimental API. (toowned_clone_into #41263)

recently added

impl ToOwned for CStr

type Owned = CString

fn to_owned(&self) -> CString

impl ToOwned for OsStr

type Owned = OsString

fn to_owned(&self) -> OsString

fn clone_into(&self, target: &mut OsString)

🔬 This is a nightly-only experimental API. (toowned_clone_into #41263)

recently added

impl ToOwned for Path

type Owned = PathBuf

fn to_owned(&self) -> PathBuf

fn clone_into(&self, target: &mut PathBuf)

🔬 This is a nightly-only experimental API. (toowned_clone_into #41263)

recently added

impl<T> ToOwned for [T] where
    T: Clone, 

type Owned = Vec<T>

Important traits for Vec<u8>

impl Write for Vec<u8>

fn to_owned(&self) -> Vec<T>

fn clone_into(&self, target: &mut Vec<T>)

🔬 This is a nightly-only experimental API. (toowned_clone_into #41263)

recently added

impl<T> ToOwned for T where
    T: Clone, 

type Owned = T

fn to_owned(&self) -> T

fn clone_into(&self, target: &mut T)

🔬 This is a nightly-only experimental API. (toowned_clone_into #41263)

recently added

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